Abstract：
:Polymer-driven flocculation and dewatering of mature fine tailings (MFT) is critical to improve their consolidation. MFT flocculation and dewatering depends on the size of the suspended clay particles, and on the composition and properties of the liquid in which they are dispersed. The effect of water chemistry on the polymer-particle dynamics is nontrivial, particularly for non-spherical, polydisperse particles such as natural clays. In this study, we used a response surface methodology to systematically assess the impact of Na+ and Ca2+ concentration and anionic polyacrylamide dosage in the flocculation and dewatering of MFT. We observed a beneficial synergistic effect between Ca2+ concentration and polyacrylamide dosage, although excess of Ca2+ may reduce polyacrylamide activity. In addition, we investigated the impact of clay particle size on MFT flocculation. Polyacrylamide did not flocculate MFT fractions where the fine clay particles (<2 μm) represented most of the population. Good settling, however, was observed when fine silt particles (from 2 to 44 μm) were present, indicating that the presence and accumulation of larger/heavier particles on the polymer-induced flocs is crucial to form aggregates that readily settle under gravity. The insights gained from this study can contribute to more efficient use of flocculants, more effective use of cations, and better understanding of the impact of particles size in MFT flocculation.
journal_name
Chemospherejournal_title
Chemosphereauthors
Motta FL,Gaikwad R,Botha L,Soares JBPdoi
10.1016/j.chemosphere.2018.05.171subject
Has Abstractpub_date
2018-10-01 00:00:00pages
263-272eissn
0045-6535issn
1879-1298pii
S0045-6535(18)31028-2journal_volume
208pub_type
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